<template>
    {{ obj.message }}
</template>

<script setup>
import { reactive } from 'vue'
const obj = reactive({
    message: '不畏浮云遮望眼，只缘身在最高层'
})
setTimeout(() => {
    obj.message = '欲穷千里目，更上一层楼'
}, 1500)
</script>